I. Or 



^O.Q 



0.6 



S 0.4 



> 0.2 



80<= 



y^ 



J L 



2 X 2 H-Pile 



I X I H-Pile 



I l_ 



100° 120° 140° 160° 180° 



Zero-Crossing Angle of fH(\|/)-H(i|/+l80°)] 



200° 



Figure D-4. Ratio o£ computed velocity heads of two orthogonal 

 wave trains versus zero-crossing angle. 



171 



